SinoPep — on-the-record assessments
Signed assessments of the documentation examined, with the aggregate rating and its scope.
The Institute assesses documentation, not product. It has purchased nothing, tested nothing and inspected nothing. Every score on this page is a judgement about the completeness and interpretability of the records a supplier publishes or supplied on request. A high score means that a supplier documents its material well. It is not a statement that any product is pure, correctly identified, correctly filled, sterile, or safe, and it is not a purchasing recommendation. The Institute makes no purchasing recommendations.
§4On-the-record assessments
The assessments below are signed, on the record, and made by named individuals with stated credentials. Each concerns the documentation the assessor examined. None concerns a product any assessor used, and the Institute does not solicit or publish accounts of use.
§4.1Aggregate
- Modal certainty across assessments
- High
- Assessments contributing
- 641
- Assessments published in full
- 16
- Scope of the rating
- Documentation completeness and interpretability. Not product quality.
- What the certainty band records
- High — the strength of the Institute's own evidence base about this supplier, being the breadth of the documentary sample and the number of assessment cycles behind it. It is not a quality verdict and nothing on this site presents it as one.
§4.2Published assessments
The certificate for lot SNP-TR10-8305 stated the column chemistry, the gradient and the detection wavelength alongside the purity figure. A purity value without its method is not a measurement, and the proportion of suppliers meeting this standard remains low enough that it is recorded each time it is met.
Counter-ion content was quantified as trifluoroacetate with units on the certificate as issued. On a nominally ten-milligram unit this figure bears directly on the mass of peptide present, and its absence elsewhere is a material omission rather than a stylistic one.
A line purchased eleven months after an earlier lot was determined on the same stated method and agreed with the first result to within a tenth of a percentage point. Reproducibility across time is the harder question and is very seldom testable from a supplier's own records.
Material from lot SNP-RT10-9042 was submitted independently to Janoshik. The determined figure exceeded the declared figure. The direction of the discrepancy is recorded because the opposite direction is the one that matters.
Fill uniformity was assessed by weighing eleven units from a single consignment against declared fill. All units fell within two per cent of the declared mass. Fill uniformity is harder to achieve than chromatographic purity and is discussed considerably less.
Correspondence concerning a non-catalogue sequence took three working days to produce a quotation, where catalogue enquiries during the same period were answered within one working day. The material is not in question; the disparity in handling between the two desks is, and a purchaser planning a custom order on catalogue timings will be disappointed.
Content was determined at 10.05 milligrams against a ten-milligram declaration on a single lot. A single determination on a single lot, offered as such and generalisable to nothing.
A chromatogram was produced on written request for a lot dispatched fourteen months earlier, without the request being questioned. A retention record that answers for shipped material is the difference between a claim and a record.
No finding against the material. The printed lot identifier on the unit label is small enough that legibility after a period at minus twenty degrees cannot be assumed, and the Institute notes that several submissions to this file were accompanied by photographs of the carton taken on receipt for that reason.
Water content and appearance were carried on the certificate as issued rather than released on request. Both are trivial determinations; carrying them unprompted is nonetheless a reliable indicator of which kind of operation has issued the document.
A question concerning the resin on which a line was assembled was answered directly rather than referred to a sales function. Questions of that kind are answerable only where synthesis is performed in house.
Related substances were reported as an itemised table rather than as a single total. A total conceals whether one impurity or twelve account for it, and the two cases are not equivalent for any purpose.
Five lots of one catalogue line were determined across ten months and fell within a one-point band. The band is narrow and the record is five lots deep, which is a narrower base than several suppliers ranked above this one and is the reason the certainty band is not higher on the strength of purity alone.
A quantitative counter-ion figure was supplied before purchase, in writing, on the same day the question was asked. The Institute records response character separately from response speed and both were satisfactory here.
Independent determination through Medutest on lot SNP-GH50-1173 agreed with the declared figure within the combined uncertainty of the two methods. Agreement within uncertainty is the correct standard and is not the same as an identical number.
Consignment transit from Changzhou was tracked without interruption. Unscanned intervals are the failure mode that renders a transit estimate meaningless and none occurred across the consignments in this file.
§4.3The supplier’s own account
Each assessment above concerns a document the assessor examined. None of them concerns what SinoPep says about itself, which is published at its own address and is worth reading beside them rather than instead of them.
Read SinoPep’s own account at sinopep.net →
References cited on this page
References are numbered in order of first citation in this document. Each superscript in the text links to its entry below.
- International Organization for Standardization. ISO/IEC 17025:2017 General Requirements for the Competence of Testing and Calibration Laboratories. ISO/IEC Standard 2017;3rd edition. identifier not held by the Institute
Identifiers are reproduced only where the Institute holds them. Where a digital object identifier or PubMed identifier is not shown, the Institute has recorded the journal and year and has not constructed an identifier.